A study was conducted to find out the concentration of sulphur dioxide in the air in parts per million (ppm) of a certain city. The data obtained for 30 days is as follows:
 0.03 0.08 0.08 0.09 0.04 0.170.16 0.05 0.02 0.06 0.18 0.200.11 0.08 0.12 0.13 0.22 0.070.08 0.01 0.10 0.06 0.09 0.180.11 0.07 0.05 0.07 0.01 0.04
 (i) Make a grouped frequency distribution table for this data with class intervals as 0.00 - 0.04, 0.04 - 0.08, and so on.
(ii) For how many days, was the concentration of sulphur dioxide more than 0.11 parts per million?

Options

A. `6`
B. `7`
C. `9`
D. `8`

Answer

D

Explanation

(i) The figure below is the grouped frequency distribution.



(ii) The number of days for which concentration of `SO2` is more than

`0.11rarr0.12-0.16,0.16−0.20,0.20−0.24`

Total number of days =2+4+2=8 days.